Costume mask



FIG. 1 is a front, elevated view of a costume mask;

FIG. 2 is a front view of the costume mask;

FIG. 3 is a rear view of the costume mask;

FIG. 4 is a right, side-view of the costume mask;

FIG. 5 is a left, side-view of the costume mask;

FIG. 6 is a top view of the costume mask;

FIG. 7 is a bottom view of the costume mask;

FIG. 8 is a front, elevated view of the costume mask, depicting the mask as being worn; and,

FIG. 9 is an interior-view of the costume mask, taken from line 9-9 of FIG. 8.

The broken lines shown in the drawings represent environmental items and unclaimed portions of the design and form no part thereof. 

CLAIM The ornamental design for a costume mask, as shown and described. 